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German champions Borussia Dortmund was defeated 1-3 away to Olympiakosin a game of "F" of the Champions League. For the Greeks were accurate Holebas (8),Djebbour (40) and Modesto (79). For vestfaltsi Robert Lewandowski scored (79). Errors in the defense failed efforts of "yellow-black."

Klopp's men missed a string of early chances in the Group E encounter before conceding sloppy goals to the Piraeus outfit, who recorded the first win of their Champions League campaign, and the 44-year-old admitted that his back-line were not up to scratch.

"It's very sobering. The goals were completely unnecessary. There wasn't enough concentration in key moments. We play nice football, but you just cannot concede those goals," Klopp mused, according to Kicker.

Despite the result, the former Mainz boss refused to admit that his side's chances of qualification had all but ended.

"There are still three games in the group. We will continue to try to earn points. We need to focus on making a better account of Dortmund in the Champions league."

Marcel Schmelzer, who played at left-back for Dortmund on the night, echoed his boss' sentiments that the defence needed work, but stated his belief that his side deserved at least a point from the clash.

"I think we played well, but conceded soft goals. We fought hard and deserved something. Last season our defence was our biggest asset, so it's strange that this year we are making so many individual mistakes at the back," the 23-year-old said.

After three games, winless Borussia Dortmund sit bottom of Group F with just a solitary point to their name.